| 1/00 | Passages or apertures for delivering primary air for combustion |
| 1/02 | Passages or apertures for delivering primary air for combustion by discharging the air below the fire |
| 3/00 | Arrangements of valves or dampers before the fire |
| 5/00 | Blast-producing apparatus before the fire |
| 5/02 | Blast-producing apparatus before the fire Arrangements of fans or blowers (fans or blowers per seF04) |
| 5/04 | Blast-producing apparatus before the fire by induction of air for combustion, e.g. using steam jet |
| 7/00 | Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam |
| 9/00 | Passages or apertures for delivering secondary air for completing combustion of fuel |
| 9/02 | Passages or apertures for delivering secondary air for completing combustion of fuel by discharging the air above the fire |
| 9/04 | Passages or apertures for delivering secondary air for completing combustion of fuel by discharging the air beyond the fire, i.e. nearer the smoke outlet |
| 9/06 | Passages or apertures for delivering secondary air for completing combustion of fuel by discharging the air into the fire bed |
| 11/00 | Arrangements of valves or dampers after the fire |
| 11/02 | Arrangements of valves or dampers after the fire for reducing draught by admission of air to flues |
| 13/00 | Construction of valves or dampers for controlling air supply or draught (in general F16K) |
| 13/02 | Construction of valves or dampers for controlling air supply or draught (in general F16K) pivoted about a single axis but having no other movement (formed as linked slats each pivoted about an axis F23L 13/08) |
| 13/04 | Construction of valves or dampers for controlling air supply or draught (in general F16K) pivoted about a single axis but having no other movement (formed as linked slats each pivoted about an axis F23L 13/08) with axis perpendicular to face |
| 13/06 | Construction of valves or dampers for controlling air supply or draught (in general F16K) slidable only |
| 13/08 | Construction of valves or dampers for controlling air supply or draught (in general F16K) operating as a roller blind; operating as a venetian blind |
| 13/10 | Construction of valves or dampers for controlling air supply or draught (in general F16K) having a compound movement involving both sliding and pivoting |
| 15/00 | Heating of air supplied for combustion |